PhotonStats GUI simply counting up continuously

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Hi,
i treid to monitor my msg/s via the PhotonStats GUI. However the GUI simply counts incoming and outgoing messages up, even under the "1sec average" readout. So the top row and bottom row values are the same and they are constantly counting up, leading to several thousand messages after some time. Shouldn't the "1sec average" readout show what it says: The average message count over 1 second?